Capacity
WD BLACK SN850X 1TB1000 GB
Samsung 990 PRO 4TB4000 GB
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What changes?
The differences at a glance
Manufacturer facts for these exact variants. The order does not declare a performance winner.
Interface
WD BLACK SN850X 1TBPCIe 4.0 ×4 / NVMe
Samsung 990 PRO 4TBPCIe 4.0 ×4 / NVMe 2.0
DRAM cache
WD BLACK SN850X 1TBUnknown
Samsung 990 PRO 4TB4 GB
BLACK SN850X 1TB: 3 unknown fields · 990 PRO 4TB: 3 unknown fields. Unknown does not mean absent.
Compare capacity and cache, not just peak speed
Manufacturer speeds are maxima under stated test conditions. They do not show sustained writing after the cache fills. TBW is a write-endurance warranty limit, not a predicted failure date; time limits also apply. Check M.2 length, interface and heatsink clearance in the host manual. Price per TB uses nominal decimal capacity and a confirmed delivered total.
| Specifications | WDBLACK SN850X 1TBWDS100T2X0ERemove | Samsung990 PRO 4TBMZ-V9P4T0BWRemove |
|---|---|---|
| Capacity | 1000 GB | 4000 GB |
| Interface | PCIe 4.0 ×4 / NVMe | PCIe 4.0 ×4 / NVMe 2.0 |
| Sequential read, up to | 7300 MB/s | 7450 MB/s |
| Sequential write, up to | 6300 MB/s | 6900 MB/s |
| NAND type | TLC 3D NAND | TLC V-NAND |
| DRAM cache | Unknown | 4 GB |
| Endurance | 600 TBW | 2400 TBW |
| Controller | Unknown | Samsung in-house |
| Random read, up to | 800000 IOPS | Unknown |
| Factory heatsink | No | Unknown |
| Drive height, up to | 2.38 mm | Unknown |
| Cache arrangement | Unknown | 4 GB DRAM |
| Shop offers | No verified offers yet | No verified offers yet |
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